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ystB distribution in nonpathogenic Y. enterocolitica strains. Within the nonpathogenic Y. enterocolitica strains, ystB-negative strains (ST181 to ST183) had seven radically different loci compared to ystB+ strains. Two particular ystB+ strains (ST184 and ST185) had no identical loci with either ystB-negative strains or other ystB+ strains.
